1304144221 has 4 divisors (see below), whose sum is σ = 1304406172. Its totient is φ = 1303882272.

The previous prime is 1304144209. The next prime is 1304144227. The reversal of 1304144221 is 1224414031.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 923308996 + 380835225 = 30386^2 + 19515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1304144221 - 2⁵ = 1304144189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1304144192 and 1304144201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304144227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123360 + ... + 133513.

It is an arithmetic number, because the mean of its divisors is an integer number (326101543).

Almost surely, 2^1304144221 is an apocalyptic number.

It is an amenable number.

1304144221 is a deficient number, since it is larger than the sum of its proper divisors (261951).

1304144221 is an equidigital number, since it uses as much as digits as its factorization.

1304144221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261950.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1304144221 is about 36112.9370309312. The cubic root of 1304144221 is about 1092.5513896236.

Adding to 1304144221 its reverse (1224414031), we get a palindrome (2528558252).

The spelling of 1304144221 in words is "one billion, three hundred four million, one hundred forty-four thousand, two hundred twenty-one".